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i have an a iphone but i dont know what cain is it so can u please help me fine out thanks.

If the back is mostlly metal, with a black strip of plastic on the bottom, it is a 1st Generation iPhone. If the back is contoured, and solid black or white with a silver apple, and grey text on the back, you have an iPhone 3G. If the back is contoured, solid white or black, and has a silver apple, and silver text, you have an iPhone 3Gs. If the back is completelly flat, and solid black or white, you have an iPhone 4. Could you post a picture of the back of your iPhone?

Um to odd to Chris Green how do I take a picture of the back of my iPhone if my camera is on my iPhone

Look on the back of your iPhone for the model number (eg A####). Using that number, check this website: https://support.apple.com/en-gb/HT201296 and find it. Hope this helps